Li+ ions diffusion into sol-gel V2O5 thin films: electrochromic properties M. Benmoussa, A. Outzourhit, A. Bennouna and A. Ihlal Eur. Phys. J. Appl. Phys., 48 1 (2009) 10502 Published online: 04 July 2009 DOI: 10.1051/epjap/2009118